Aquatic Garter Snake

Thamnophis atratus

The aquatic garter snake, scientifically known as Thamnophis atratus, is a fascinating semi-aquatic reptile predominantly found in the western United States, particularly in California and southern Oregon. This species thrives in habitats ranging from freshwater streams and ponds to marshes and wet meadows. Characterized by its slender, elongated body, the aquatic garter snake typically measures between 18 to 40 inches in length. It displays a variety of color patterns that can range from olive and dark green to black, often accented by a distinctive yellow or cream stripe running along its back.

Adapted to both aquatic and terrestrial environments, Thamnophis atratus is an adept swimmer and frequently hunts both in water and on land. Its diet primarily consists of small amphibians, fish, and invertebrates. The aquatic garter snake is viviparous, giving birth to live young rather than laying eggs, which is an adaptation advantageous in its water-abundant habitats. Despite its name, the aquatic garter snake does not rely solely on water and can often be found basking on sunny riverbanks or venturing into nearby terrestrial areas for foraging. This species plays a significant role in its ecosystem as both predator and prey, contributing to the ecological balance of its environment.